Issue 36, 2015

Controlling alloy formation and optical properties by galvanic replacement of sub-20 nm silver nanoparticles in organic media

Abstract

Galvanic replacement is a versatile synthetic strategy for the synthesis of alloy and hollow nanostructures. The structural evolution of single crystalline and multiply twinned nanoparticles <20 nm in diameter and capped with oleylamine is systematically studied. Changes in chemical composition are dependent on the size and crystallinity of the parent nanoparticle. The effects of reaction temperature and rate of precursor addition are also investigated. Galvanic replacement of single crystal spherical and truncated cubic nanoparticles follows the same mechanism to form hollow octahedral nanoparticles, a mechanism which is not observed for galvanic replacement of Ag templates in aqueous systems. Multiply twinned nanoparticles can form nanorings or solid alloys by manipulating the reaction conditions. Oleylamine-capped Ag nanoparticles are highly adaptable templates to synthesize a range of hollow and alloy nanostructures with tuneable localised surface plasmon resonance.

Graphical abstract: Controlling alloy formation and optical properties by galvanic replacement of sub-20 nm silver nanoparticles in organic media

Supplementary files

Article information

Article type
Paper
Submitted
03 apr 2015
Accepted
29 jun 2015
First published
30 jun 2015

CrystEngComm, 2015,17, 6999-7005

Author version available

Controlling alloy formation and optical properties by galvanic replacement of sub-20 nm silver nanoparticles in organic media

G. Collins, E. K. McCarty and J. D. Holmes, CrystEngComm, 2015, 17, 6999 DOI: 10.1039/C5CE00659G

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